Enter your SkyJet pressure, flow rate and SkyHose inner diameter to find the recommended nozzle #.
Unit system
SkyJet pressure & flow
SkyHose inner diameter
Based on 50 m hose length
Recommended SkyNozzle
US Industry Standard Size
The calculator above returns a nozzle # — the orifice size in 1/64-inch increments — for your chosen SkyJet pressure, flow rate, and SkyHose diameter. The guide below explains how to turn that number into a complete drone pressure washing nozzle configuration: which nozzle type to fit, which hose is mandatory, and what pressure and water temperature each surface demands.
How the SkyNozzle Calculator Works
The calculator determines the orifice diameter required to pass your specified flow at the pressure actually reaching the nozzle — not the pressure leaving the pump.
It runs in two stages. First it models hose friction loss using the Darcy–Weisbach equation with the Blasius friction correlation, based on a 50 m (164 ft) SkyHose length, water at 20°C (68°F), and a density of 1,000 kg/m³. This yields the net nozzle inlet pressure. Second, it solves the orifice flow equation — Q = Cd × A × √(2P/ρ), with a discharge coefficient of Cd = 0.95 — for the orifice area, then converts that to a nozzle # using the ANSI/ASME standard where one unit equals 1/64 inch (0.397 mm).
The friction-loss indicator matters: when hose resistance consumes more than 20% of pump pressure, the combination is flagged red. The fix is almost always a wider SkyHose, which delivers more pressure to the nozzle and lets a smaller, higher-velocity orifice do the cleaning.
What Is Drone Pressure Washing Nozzle Configuration
Drone pressure washing nozzle configuration is defined as the complete selection of nozzle type, orifice size, spray angle, hose diameter, operating pressure, and chemical injection mode matched to a specific surface and contamination type.
A mismatch at any point in this chain produces one of three failure modes: insufficient cleaning impact, surface damage from an over-concentrated jet, or back-pressure overload on the pump when the orifice is too small for the hose and flow combination. The key difference between drone and ground-based configuration is standoff distance. A drone works at 0.5–2 m (1.6–6.6 ft) from the facade, so the jet geometry at the nozzle exit directly governs coverage width, impact force, and drift.
The WasherDrone Nozzle Family
WasherDrone supplies four nozzle types as part of its peripheral product line, each engineered for a distinct role. For a full pre-purchase comparison, see our guide on how to select the right nozzle for drone pressure washing.
| Nozzle | Type | Pressure Range | Primary Role |
|---|---|---|---|
| Jet Nozzle Pack | Fan jet — 0°/15°/25°/40° | 100–200 bar (1,450–2,900 psi) | Precision cleaning; multi-angle versatility |
| Sweeping Turbo Nozzle | Oscillating jet, 30° sweep | 60–200 bar (870–2,900 psi) | Wide coverage; stone, metal, concrete |
| Rotary Turbo Nozzle | Rotating jet, 22° cone | 52–200 bar (754–2,900 psi) | Solar panels; delicate or uniform surfaces |
| Jet Foam Nozzle | Chemical injection | Full range | Pre-treatment; always paired with a cleaning nozzle |
The Sweeping Turbo Nozzle is the de facto standard for most facade scenarios. The Jet Nozzle Pack gives surgical precision for joints and edges. The Rotary Turbo Nozzle is the mandatory choice for solar panels. The Jet Foam Nozzle never cleans alone — it is always paired with a second nozzle.
Hose-to-Nozzle Compatibility
Hose-to-nozzle compatibility is the constraint that overrides all other configuration preferences. The wrong hose creates back-pressure that stresses the pump and reduces cleaning performance.
This is exactly what the calculator’s friction-loss indicator surfaces. For a full breakdown, see our guide on how to choose the right hose for drone cleaning systems.
| Hose | Inner Diameter | Max Flow | Compatible Nozzles |
|---|---|---|---|
| SkyHose 5/6 | 1/4 in (6 mm) | 11.4 L/min (3.0 GPM) | Jet Nozzle Pack 3.0 (full range); Sweeping Turbo C30 (max 100 bar / 1,450 psi); Rotary Turbo 3.0 (caution at 200 bar); Jet Foam |
| SkyHose 8 | 5/16 in (8 mm) | 17.8 L/min (4.7 GPM) | All nozzles — full pressure range. Field standard. Mandatory for dual nozzle. |
| SkyHose 10 | 3/8 in (10 mm) | 25.7 L/min (6.8 GPM) | All nozzles — full pressure range. Maximum-capacity deployments. |
The operative rule: SkyHose 8 is the field standard. It accommodates every nozzle across the full pressure range and is mandatory for all dual nozzle configurations without exception.
Application Matrix by Surface Type
The table below defines the recommended configuration for each surface encountered in drone-based facade cleaning operations. These combinations are derived from WasherDrone’s operational testing data.
| Surface | Nozzle | Qty | Hose | Pressure | Chemical | Hot Water |
|---|---|---|---|---|---|---|
| Glass facade | Sweeping Turbo C30 | 1 | SkyHose 8 | 100–150 bar (1,450–2,175 psi) | Optional | Optional max 90°C (194°F) |
| Aluminium composite | Jet Nozzle Pack 3.0 | 1 | SkyHose 5/6 | 100–130 bar (1,450–1,885 psi) | No | Optional max 60°C (140°F) |
| Ceramic / coated | Jet Nozzle Pack 3.0 | 1 | SkyHose 5/6 | 100–150 bar (1,450–2,175 psi) | Optional | Optional |
| Stone / concrete | Sweeping Turbo C30 | 1 | SkyHose 8 | 150–200 bar (2,175–2,900 psi) | Yes | Yes — 90°C (194°F) |
| Construction dust | Sweeping Turbo C30–C35 | 1 | SkyHose 8 | 150–200 bar (2,175–2,900 psi) | Yes | Yes |
| Metal facade | Sweeping Turbo C30 | 1 | SkyHose 8 | 150–200 bar (2,175–2,900 psi) | Yes | Yes — 90°C (194°F) |
| Solar panels | Rotary Turbo 3.0 | 2 | SkyHose 8 | 60–80 bar (870–1,160 psi) | No | PROHIBITED |
| Large flat facade | Jet Nozzle Pack 3.0 | 2 | SkyHose 8 | 100–150 bar (1,450–2,175 psi) | Optional | Optional |
| Chemical + rinse | Jet Foam + Jet Nozzle Pack 3.0 | 2 | SkyHose 8 | 100–150 bar (1,450–2,175 psi) | Yes | Optional |
Fan Angle Selection for the Jet Nozzle Pack
Fan angle selection determines impact concentration versus surface coverage. It follows a fixed sequence based on soiling type and geometry.
- Localised hard soiling — joints, corners, recesses: 0° point nozzle as a pre-pass; follow with 25° or 40° for the main wash.
- Wind or extended standoff distance: 15° — maintains impact at greater distances.
- Standard soiling, standard standoff: 25° — the default for most scenarios.
- Light soiling, close standoff, large flat surface, or rinse: 40° — maximum coverage, minimum concentration.
The 0° nozzle is never a standalone cleaning pass on open surfaces — it is a precision instrument for confined soiling, used before the primary nozzle covers the zone.
Dual Nozzle Drone Washing Setup
A dual nozzle drone washing setup increases coverage rate and enables two-stage cleaning within a single flight. It is not universally appropriate.
When dual nozzle is recommended
- Solar panel arrays: 2× Rotary Turbo Nozzle 3.0
- Large flat facades: 2× Jet Nozzle Pack 3.0
- Chemical plus rinse jobs: Jet Foam Nozzle + Jet Nozzle Pack 3.0
When it is not appropriate
- Narrow or geometrically complex surfaces
- Corner and joint detail cleaning
- Any scenario where jet interference would degrade impact precision
Non-negotiable rule: all dual nozzle configurations require SkyHose 8. The combined flow of two nozzles exceeds SkyHose 5/6 capacity in every case — and the calculator will flag the resulting friction loss red.
Hot Water Rules
Hot water materially improves performance on biological soiling, grease films, and mineral deposits — but it is not universally permitted.
- Solar panels: prohibited. Thermal-shock risk; water above 60°C (140°F) on a cold panel risks micro-crack formation. Use ambient-temperature water only.
- Aluminium composite: caution. Maximum 60°C (140°F); higher risks adhesive-layer delamination on older panels.
- Stone, concrete, metal: highly effective at 90°C (194°F) for algae, moss, hydrocarbon films, and traffic grime.
- Glass facades: operator discretion based on surface age, coating, and joint material.
Frequently Asked Questions
What is nozzle # and how is it calculated?
Nozzle # is the ANSI/ASME standard notation for orifice size, where one unit equals 1/64 inch (0.397 mm). The calculator derives it as orifice diameter (mm) ÷ 0.397, after solving the orifice flow equation for the diameter needed to pass your flow at the net nozzle inlet pressure.
Why does a wider hose result in a smaller recommended nozzle #?
A wider hose has lower friction loss, so more pump pressure reaches the nozzle. Higher inlet pressure lets a smaller orifice pass the same flow rate, and the reduced diameter increases exit velocity — which improves cleaning impact at the facade.
Can I use SkyHose 5/6 for a dual nozzle configuration if I keep the pressure low?
No. SkyHose 5/6 has a maximum flow rate of 11.4 L/min (3.0 GPM), insufficient to supply two nozzles simultaneously at any useful pressure. SkyHose 8 is mandatory for all dual nozzle setups without exception.
What pressure and flow should I use for drone facade cleaning?
SkyJet pumps run from 150 bar (2,175 psi) at 10 L/min (2.6 GPM) up to 200 bar (2,900 psi) at 20 L/min (5.3 GPM), depending on configuration. For standard facade work, target 120–150 bar (1,740–2,175 psi) at the nozzle inlet. The calculator subtracts hose friction loss and shows the net inlet pressure for your selection.
Why is 50 m used as the base hose length?
50 m (164 ft) is the standard SkyHose deployment length for most WasherDrone field operations. Longer runs increase friction loss and reduce effective nozzle inlet pressure. For installations needing a longer hose, contact WasherDrone for a custom calculation.
The drone nozzle calculator ensures you select the right nozzle for efficient cleaning.